Method for judging compressibility of rocks in different well sections of horizontal well for developing natural fractured reservoir

A technology of natural fractures and determination methods, which is applied in wellbore/well components, earth-moving drilling, and fluid production, etc. It can solve the evaluation of reservoir rock compressibility without considering the influence of natural fracture compressibility, without considering weights There is no set of mature comprehensive evaluation methods and other problems

Pending Publication Date: 2021-05-04
PETROCHINA CO LTD
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Problems solved by technology

This method does not take into account the weight of each factor, nor does it consider the impact of natural fractures on compressibility
[0017] It can be seen that there is no mature and unified comprehensive evaluation method for reservoir rock compressibility evaluation at present.

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  • Method for judging compressibility of rocks in different well sections of horizontal well for developing natural fractured reservoir

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[0035] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0036] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0037] For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the ...

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Abstract

The invention provides a method for judging compressibility of rocks in different well sections of a horizontal well for developing a natural fractured reservoir. The method for judging the compressibility of the rocks in different well sections of the horizontal well with the natural fractures comprises the steps that 1, in the drilling process of the horizontal well, rock debris samples at the different well sections are collected; 2, the rock debris samples are observed by using an electron scanning microscope to obtain the natural fracture development condition, the rock brittleness and the rock pore development process condition of the corresponding well section; and 3, the compressibility index of the rocks in the corresponding well section is calculated through a weight scoring method. According to the method, the rock debris samples of the whole horizontal section are collected and analyzed, the compressibility index of the rocks of the horizontal sections is obtained, then the compressibility distribution of the rocks of the horizontal sections is determined, the position with the high compressibility index can be selected as much as possible in the follow-up fracturing design to set a perforation point, and the fracturing segmented optimization design is completed.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for judging the compressibility of rocks in different sections of a horizontal well with natural fracture reservoirs. Background technique [0002] Fractured volcanic reservoirs have poor matrix physical properties, well-developed natural fractures, and thick oil layers. Large-scale volume fracturing must be used to effectively produce reserves. This kind of reservoir has shallow burial depth, hard and brittle reservoir rock, well-developed natural fractures, and small two-dimensional stress difference. It is suitable for large-volume construction to increase the complexity of artificial fractures, realize fracture network stimulation, and improve stimulation effects. [0003] The current fracturing design method is mainly to select engineering sweet spots as perforation points in geological sweet spots based on conventional logging curve interpretation co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/26
CPCE21B49/00E21B43/26
Inventor 石善志田刚于会永孙宜成陈昂徐文熙田文浩陈禹欣
Owner PETROCHINA CO LTD
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